题目内容
能简便计算的要简便计算.
|
|
4×(
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|
(
|
|
考点:分数的简便计算
专题:运算顺序及法则
分析:(1)把
看作
×1,根据乘法的分配律计算;
(2)直接根据乘法的分配律计算;
(3)先算括号内的,后算括号外的;
(4)除以一个数等于乘以这个数的倒数,再根据乘法的分配律计算;
(5)运用乘法分配律简算;
(6)先算乘除法,后算加法.
| 2 |
| 7 |
| 2 |
| 7 |
(2)直接根据乘法的分配律计算;
(3)先算括号内的,后算括号外的;
(4)除以一个数等于乘以这个数的倒数,再根据乘法的分配律计算;
(5)运用乘法分配律简算;
(6)先算乘除法,后算加法.
解答:
解:(1)
×6+
=(6+1)×
=7×
=2
(2)
×
+
×
=
×(
+
)
=
(3)4×(
+
)
=4×
=
(4)
×
+
÷
=
×
+
×
=
×(
+
)
=
×1
=
(5)(
+
+
)×24
=
×24+
×24+
×24
=8+4+3
=15
(6)
×
+
÷
=
+1
=
| 2 |
| 7 |
| 2 |
| 7 |
=(6+1)×
| 2 |
| 7 |
=7×
| 2 |
| 7 |
=2
(2)
| 7 |
| 16 |
| 5 |
| 6 |
| 7 |
| 16 |
| 1 |
| 6 |
=
| 7 |
| 16 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 7 |
| 16 |
(3)4×(
| 2 |
| 3 |
| 1 |
| 6 |
=4×
| 5 |
| 6 |
=
| 10 |
| 3 |
(4)
| 5 |
| 12 |
| 5 |
| 6 |
| 7 |
| 12 |
| 6 |
| 5 |
=
| 5 |
| 12 |
| 5 |
| 6 |
| 7 |
| 12 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 5 |
| 12 |
| 7 |
| 12 |
=
| 5 |
| 6 |
=
| 5 |
| 6 |
(5)(
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 8 |
=
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 8 |
=8+4+3
=15
(6)
| 1 |
| 2 |
| 2 |
| 5 |
| 9 |
| 10 |
| 9 |
| 10 |
=
| 1 |
| 5 |
=
| 6 |
| 5 |
点评:此题考查的目的是理解掌握加法、除法的运算性质和乘法的运算定律,并且能够灵活运用这些运算性质和运算定律进行简便计算.
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